<?php
/*
 * Copyright (c) 2013 Eugene Kuzmenko
 *
 * Permission  is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in  the Software without restriction, including without limitation the rights
 * to  use,  copy,  modify,  merge, publish, distribute, sublicense, and/or sell
 * copies  of  the  Software,  and  to  permit  persons  to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The  above  copyright  notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE  IS  PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED,  INCLUDING  BUT  NOT  LIMITED  TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS  FOR  A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS  OR  COPYRIGHT  HOLDERS  BE  LIABLE  FOR  ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * For more information, see <http://www.aljey.com>.
 */

namespace Al\Core\Lib\CacheDriver;

use Al\Core\Lib\AbstractProxiedParameterHolder;

/**
 * Provides persistent storage in the php redis cache through a highly
 * convenient array-like interface.
 * 
 * You have to install the redis server and a php redis extension to use this
 * cache driver:
 * <code>
 * sudo apt-get install redis-server
 * sudo apt-get install php5-dev
 * git clone git://github.com/nicolasff/phpredis.git
 * cd phpredis
 * phpize
 * ./configure
 * make
 * sudo -s make install
 * // add extension=redis.so to php.ini and restart the server
 * </code>
 *
 * @author Eugene Kuzmenko <mail@aljey.com>
 */
class Redis extends AbstractProxiedParameterHolder {
  
  /**
   * @var \Redis A redis instance.
   */
  private $redis;
  
  /**
   * {@inheritDoc}
   */
  public function __construct() {
    $this->redis = new \Redis();
    $this->redis->connect('127.0.0.1');
    parent::__construct($this->redis->keys('*'));
  }
  
  /**
   * {@inheritDoc}
   */
  public function delete($offset) {
    $this->redis->delete($offset);
  }
  
  /**
   * {@inheritDoc}
   */
  public function get($offset) {
    return unserialize($this->redis->get($offset));
  }
  
  /**
   * {@inheritDoc}
   */
  public function set($offset, $value) {
    $this->redis->set($offset, serialize($value));
  }
  
}